cJSON的一个简单的例子

/*
* case1.c
*
*
Created on: 2018年3月30日
*
https://github.com/DaveGamble/cJSON
*/
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
#include "cJSON.h"
//create a monitor with a list of supported resolutions
char* create_monitor(void)
{
const unsigned int resolution_numbers[3][2] = {
{1280, 720},
{1920, 1080},
{3840, 2160}
};
char *string = NULL;
cJSON *name = NULL;
cJSON *resolutions = NULL;
cJSON *resolution = NULL;
cJSON *width = NULL;
cJSON *height = NULL;
size_t index = 0;
cJSON *monitor = cJSON_CreateObject();
if (monitor == NULL)
{
goto end;
}
name = cJSON_CreateString("Awesome 4K");
if (name == NULL)
{
goto end;
}
/* after creation was successful, immediately add it to the monitor,
* thereby transfering ownership of the pointer to it */
cJSON_AddItemToObject(monitor, "name", name);
resolutions = cJSON_CreateArray();
if (resolutions == NULL)
{
goto end;
}
cJSON_AddItemToObject(monitor, "resolutions", resolutions);
for (index = 0; index < (sizeof(resolution_numbers) / (2 * sizeof(int))); ++index)
{
resolution = cJSON_CreateObject();
if (resolution == NULL)
{
goto end;
}
cJSON_AddItemToArray(resolutions, resolution);
width = cJSON_CreateNumber(resolution_numbers[index][0]);
if (width == NULL)
{
goto end;
}
cJSON_AddItemToObject(resolution, "width", width);
height = cJSON_CreateNumber(resolution_numbers[index][1]);
if (height == NULL)
{
goto end;
}
cJSON_AddItemToObject(resolution, "height", height);
}
string = cJSON_Print(monitor);
if (string == NULL)
{
fprintf(stderr, "Failed to print monitor.n");
}
end:
cJSON_Delete(monitor);
return string;
}
int main(void)
{
char *p;
p=create_monitor();
printf("%sn",p);
printf("length(p)=%dn",strlen(p));
}

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